George fleischel and joseph bertrand



(MMM-J G. FLB1SCHEL su J. BERTRAND.

l LOOK.

No. 479,104. v Patented Ju1y`19, 1892.

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NITED STATES PATENT OFFICE.

GEORGE FLEISCHEL AND JOSEPH BERTRAND, OF SAN FRANCISCO, CALlFORNIA.

LOCK.

SPECIFICATION forming part of Letters Patent No. 479,104, dated July 19,1892.

Application filed March 24, 1892.

T all whom it may concern.:

Beit known' that we, GEORGE FLEIsoHEL and JOSEPH BERTRAND, citizens ofthe United States, and residents of the city and county of SanFrancisco, and State of California, have invented certain new and usefullmprovements in Locks; and we do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

Our invention relates to improvements in sliding-door locks; and theobject of our improvements is to provide a lock which will work withgreater ease and smoothness and be more durable than other locks of thissame class.

Referring to the drawings, Figure lis a side elevation of a lockapplicable to sliding doors connecting different apartments of a house,

one side of the lock-case being removed. Fig. 2 is a similar view of alock specially adapted for e1evator-doors. Fig. 3 is a cross-sectiontaken from the center of Fig. 2, looking toward the left; and Fig. 4 isa detail view of a spring-actuated pin used in connection With the boltsof our improved lock.

Similar letters of reference indicate similar parts in the four views.

A is the case, which is made of cast-iron or brass, as usual.

B B are L-shaped bolts, the stem of which lies within the case betweenthe rim a and a guide a d2, and whose base projects out through sanaperture in the rim. These bolts are movable to and from each other andadapted to pass through and engage with a striker plate or keeper C,facing the rim of the lock. The bolts are shot and withdrawnsimultaneously by means of interconnected levers D D', provided withenlarged tips cl d', engaging recesses o h in their innermost ends. D Doscillate about pivots at d2 d3 and are urged forward at their connectedends by a spring E, so that the bolts may be kept apart or in a lockedposition, and it requires pressure from the side opposite the springsuf- Serial No. 426,288. (No model.)

iicient to overcome the tension thereof toV swing back the levers andhave the bolts together or unlocked. The levers may be connected to eachother in any way permitting them free action-as, for instance, bythinning down the end of one and fitting it in a notch in the end of theother, as shown at d4. The levers are swung backward to withdraw thebolts through the medium of cams F, revolving with the hub f of thedoor-knobs in the case of ordinary house sliding doors and by means of apivoted handpiece F', reached and pressed back through an opening f inthe face of the lock, in the case of elevatordoors. F and F operate uponthe levers in the same manner by being driven against their connectedends; but they differ, in that the handpieoe is not made so as to bereadily worked from either side of the door. The reason of this is that,while it is convenient to have the ordinary doors open readily fromeither side, it is very important, in order to prevent accidents, togive none but persons riding in an elevator the facility of openingwithout a key the doors giving unto the elevator-well. A furtherdifference between the cams and the handpiece is to be found, in thatthe former are merely subject to the action of the spring E in beingturned aside after the door-knobs have been released and the bolts againshot, whereas the latter is provided with its own spring G, which isWound about its pivoted end f 2. This spring constantly pushes thehandpiece into the aperture f and normally keeps its free end restingagainst a stop f3 and wedged in between this stop and one of thelevers.Thus constructed and disposed the handpiece is always within easy reachof an elevator-attendant, and by checking the movements of the leversprevents the unlocking of the bolts from the outside by means of a knifeor some similar instrument, which might be inserted between thelock-case and the striker-plate. lf, however, the piece F is pressedback by hand to withdraw the bolts in the regular manner, its free endthen falls within a curve d5 in one of the levers and is held thereinuntil the bolts are again returned to theirlocked position. F may alsobe set back from the outside of the elevator-door by IOO means of a keypassing through ordinary holes in the back plate A of the lock, in whichcase the pin ot the key enters and revolves in either of two holes@361,4 in the face-plate, and its web is turned so as to engage with aange f4t at the rear edge of the handpiece. The camoperated levers maybe secured in place to prevent the Withdrawal of the bolts as Well asthose operated by the handpiece; but with them it is done by the use ofan ordinary bolt H and tumbler I, actuated by a key in the usual Way,the bolt being made to slide back of the levers at the point where theyare connected, so that they cannot be moved by the cams.

A special feat-ure of our improved lock is that the bolts when they areretracted and the door is slid open do not immediately spring back totheir locked position, as in other locks of the same type, but they arekept together intheir retracted position until the door is closed again.They are so kept together by means of a pin J, pressed by a spring K andprovided with a projection or `stump j, passing beyond the end of one ofthe bolts, as shown in Figs. l and 4, or engaging a notch b2 therein, asrepresented at Fig. I2, when the bolts are Withdrawn, the end of the pinJ then projecting out a little farther through a hole a5 in the rim a inwhich it rests. The object of this construction is to avoid the constantfriction occurring between the bolt-tips and the nosing of the keeperwhen the bolts are let into the keeper through forced contact with theedges of the aperture in the striker plate and which wears out thosepieces in a short while. The bolt-tips, being kept "together, go throughthe striker-plate without touching it, and it is only after thestriker-plate has pushed back the pin J and released the bolts that theycome apart and lock the door. It is for the same reason that thebolt-tips are made square in the case of elevator-door locks, asillustrated in Fig.i2, so that if the pin has been driven back for anycause they will strike squarely against the plate C upon the door beingclosed and not be forced into the keeper until properly retracted, asmight happen were they made of the ordinary beveled form. As to locksfor house sliding doors, which are not opened and closed so oii'ten noraccessible to all sorts of people and which are provided with knobseasily operated from either side, it is perhaps more convenient to havethe outermost ends of the bolts beveled, as shown at Fig. l.

The back plate A', Fig. 3, does not diilcr from the ordinaryconstruction, except that it is provided with an inwardly-projectingflange Z, which lies between a similar Iiange or stop Z', projectingfrom the face-plate and the bolts B B. These flanges mutually contributein preventing the bolts from being sprung or displaced in case theirouter ends are forced against the striker-plate.

Having described our invention, what we claim as new, and desire tosecure by Letters Patent of the United States, is-

l. The combination, in a lock, of simultaneously-sliding bolts,spring-pressed interconnected levers engaging said bolts and normallykeeping them in a locked position, and means to depress the connectedends of `said levers and thereby withdraw the bolts, substantially asset forth.

2. The combination, in a lock, of simultaneously sliding bolts normallykept in a locked position, spring-pressed interconnected leverscontrolling the same, a depressing device acting on said levers towithdraw said bolts, and means to keep said bolts retracted,

substantially as set forth.

3. The combination, in a lock, of simultaneously-sliding bolts,interconnected levers engaged therewith, a spring pressing upon theconnected ends of said levers and holding said bolts in a lockedposition, a device adapted to depress said levers oppositely to saidspring and thereby retract the bolts, a springactuatedoutwardly-projecting pin engaging and holding the bolts when retracted,and a striker-plate contacting with the projecting end of said pin,substantially as set forth.

4. The combination, in a lock, of simultaneously-movable bolts,spring-pressed interconnected levers normally `keeping the same in alocked position, a stop f3, and a pivoted lever depressing handpieceVthe free end whereof is normally wedged in between said stop and one ofsaid levers, substantially as set forth.

In testimony whereof we affix our signatures in presence ot twowitnesses.

GEORGE FLEISCIIEL. [L. s] J OSEPII BERTRAND. LL. s] Witnesses:

A. M. WENTWonrr-r, A. A. BAXTER.

